Similar to 短縮URL

Transifex

Tripod (web hosting)

.tt

Tumblr

.tv

.tw

Typepad

.ua

.ug

.uk

Urchin (software)

.uy

.uz

.vc

.ve

.vg

Visual.ly

.vn

.vu

Vyatta

VyOS

Web Accessibility Initiative

Web application firewall

Web Proxy Auto-Discovery Protocol

Web GIS